Method of forming severable flanges for slip covers and the like



' Dec. 27, 1938. L E, LA BQMBARD 2,141,161

METHOD OF FORMING SEVERABLE FLANGES FOR SLIP COVERS AND THE LIKE Original Filed Dec. 12, 1934 7 'VENTOR.

Z7 Z4 ATTORNEYS;

Pntented Dec. 27, 1938 UNITED STATES PATENT OFFICE METHOD OF FORMING SEVERABLE FLANGES FOR SLIP COVERS AND THE Original application December 12, 1934, Serial Divided and this application October 30, 1936, Serial NO. 108455 4 Claims. (C1- 93-391) This invention relates to a method of forming slip covers for cylindrical containers of the type disclosed in my copending application, Ser. No.

757,164, filed December 12, 1934, of which this application is a division.

The invention consists in the method hereinafter described and claimed. 1

In describing this invention, reference is he to the accompanying drawing in which like charmeters designate corresponding parts in all the 3'1 flsa side elevation of a slip cover made inaccordaiice with my method and showing a gcntiguoiis portion of the container, both being fi'Figure 2 is a perspective view of a slip cover formed by the method herein described and illustrating the cover after the same has been re moved from the container.

20 Figure 3 is'a perspective view of the flange of the slip cover shown in Figure 2.

Figure 4 is a diagrammatic view illustrating the initial steps in carrying out the method herein described.

25 The slip cover, formed in accordance with the method herein described and claimed, is intended for use with fibrous cylindrical containers and is itself formed of fibrous material, such as paper, the construction of the cover being such that it 30 is readily removable from the container by severing the depending flange of the cover which is effected by the novel construction of the same.

The object of this invention is a method by which a cover of such construction can be eco- 35 nomically manufactured in large volumes. The

flange oi the slip cover is in the nature of a cylindrical tube and accordingly, the method herein referred to may be utilized to produce fibrous tubes of a structure which will permit ready 40 severance of the tube, whereby the tube may be conveniently removed from any contents contained in the tube.

The slip cover shown in the illustrated embodiment of my invention comprises a discoidal 45 portion Ill acting as a closure for the container and which is formed or provided with a depending cylindrical flange II which is of a diameter to slidably flt the upper end of the container barrel l2 in rather tight relation. The outer surface iii) of the flange II is provided with an incision 13 extending substantially through half the thickness of the flange, and the inner surface of the flange is provided with an incision ll extending parallel to the incision l3 and in spaced apart as relationship thereto. The incision ll extends outwardly through substantially one-half the thickness of the flange. The incisions l3, l4, define overlapping portions I5, I8. If the container is filled with liquid, or semi-liquid products, the container barrel l2 has a tendency to 5 swell or expand, in which instance the slip cover becomes tightly secured to the body of the container and is removed with appreciable difficulty.

In the construction above described, the slip cover may be readily removed from the body of 10 the container by grasping the end I! of the outer overlapping portion li-and pulling it outwardly resulting in a severance of the flange II by separation of the overlapping portions l5, IS, the flange assuming the position shown in Figure 2.

This invention has to do particularly with the method of forming the overlapping portions It, It, of the flange, and more particularly in forming the incisions l3, It. This method comprises generally, winding a tube having a plurality of overlapping layers with the layers arranged relatively to produce a spacing between the joints of the inner layer with those of the outer layer to provide an overlapping or severable portion of the flange.

Those skilled in the art of fabricating paper products are familiar with the commonly used method of winding paper tubes. These tubes are wound by feeding a plurality of strips of paper to a mandrel and wrapping the same about the mandrel in overlapping relationship. The strips are fed to the mandrel and wrapped about the same by continuously operating endless belts, the strips and belts being arranged at an angle relative to the axis of the mandrel, the angle determining the pitch of the wrapped layers of paper and the angle results from the width of the strips employed and the relative diameter of the mandrel, or the finished tube. Machines embodying this structure have been in common use over a long period of years.

I obtain the flange construction above described by the novel arrangement of the strips of paper fed to the mandrel of the tube winding machine. As here shown, the inner layer of the tube T is composed of two strips 20, 22, and the outer layer of a single strip 23 of width equal to the combined widths of the strips 20, 22. Normally, the

inner and outer layers of the tube are wound so 5 that the spiral joint of the outer layer overlaps the center of the inner layer and vice-versa, the spiral joint of the inner layer overlaps the middle of the outer layer. In other words, when the tube is cut through any plane, the outer seam or joint is spaced 180 from the inner seam or joint 30, Figure 3.

To produce the flange shown in Figures 1 to 3, I divide the innerlayer or strip into the two strips 20, 22. One of these strips, as strip 22 is of less width than the depth of the flange ii of the slip cover. This results in the Joint 24 between the strips 20, 22, being arranged slightly spaced apart or offset axially from the joint 25 formed by the convolutions or turns oi the outer layer 23. The tube T thus wound is subsequently cut into sections, for example on lines 26, to form the flanges II, in which instance the portion indicated at 25, Figure 4, becomes the end or point ll of the outer overlapping portion ii of the dense. I

It will be understood by those skilled in the art that the width of the inner and outer layers and the relative width of the strips 20, 22, will depend upon the diameter and the length of the flange or tube to be produced. To carry out the invention, or to make a practical article, it is necessary that the lead or pitch of the joints 24, 25, be formed at an appreciable angle to the axis of i the tube or flange. Otherwise, it the lead or pitch is slight, the incisions I2, I, might extend completely around the flange or tube one or more times, depending upon the length of the tube or flange. For example, in the flange of the slip cover, as shown in Figures 1- and 3, the lead of the incisions l3, I4 and their relative spacing is such that the overlapping portions extend throughout 90 or less of the circumference of the flange, and because of the comparatively steep pitch or lead of the incisions, the overlapping portions l5, It, may be readily and quickly severed. This results in a complete severance of the full width of the flange.

It will be evident that this steep pitch or lead with a comparatively narrow overlapping portion can not be obtained by winding the tube in the ordinary manner. In order to obtain the steep lead or pitch, it would be necessary to employ strips or layers of comparatively great width, with the result that the overlapping portion would be equal to one-half the width of the layers of the tube. By my method of winding, the steep lead or pitch can be readily obtained by employing inner and outer layers of appreciable width, and at the same time the overlapping portions i 5, i6, may be varied at will by varying the width of one of the strips making up one of the layers, preferably by varying the strip as 22 of the inner layer, by which procedure the width of the overlapping portions may be varied from very slight width to approximately onehalf the width of the winding layers.

It will be observed that by my method the cost of winding the tube to obtain this particular result is not increased, nor is the production 01' the tube slowed. up, and-.the utility oi? the completed product is readily apparent.

What I claim is:

1. The method of making slip covers for cylindrical containers comprising a discoidal portion and a depending flange portion, consisting in forming a tube of thin, flexible material having 'a plurality of layers, forming one of said layers of a plurality of strips with one of said strips not greater in width than the depth of the flange oi the slip cover, severing the tube into sections, and securing a disk to one end of each section.

2. A method of making severable tubes consisting in winding a tube of thin, flexible material having a plurality of layers, forming one of said layers of a plurality of strips, one of said strips being of less width than the other, and the combined width of said strips being equal to the width of said other layer. 1

3. The method of making slip covers for cylindrical containers comprising a discoidal portion acting as a closure for the open end of the container, and a depending flange portion, said method consisting in winding a layer of thin, flexible material in tube form, winding a second layer superimposed on the first layer, said second layer being oiiset relative to the first layer axially of the tube a distance less than the depth or the flange of the slip cover, severing the tube into sections, and securing a disk to one end of each section.

4. The method of making slip covers for cylindrical containers comprising a discoidal portion and a depending flange, said method consisting of winding two strips of thin, flexible material of unequal width in parallel helical formation to constitute the inner layer of the tube,

winding a third strip on said inner layer, said LEON a LA BOMBARD. 

